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diff --git a/js/ui/ripples.js b/js/ui/ripples.js
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+// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
+/* exported Ripples */
+
+const { Clutter, St } = imports.gi;
+
+// Shamelessly copied from the layout "hotcorner" ripples implementation
+var Ripples = class Ripples {
+ constructor(px, py, styleClass) {
+ this._x = 0;
+ this._y = 0;
+
+ this._px = px;
+ this._py = py;
+
+ this._ripple1 = new St.BoxLayout({ style_class: styleClass,
+ opacity: 0,
+ can_focus: false,
+ reactive: false,
+ visible: false });
+ this._ripple1.set_pivot_point(px, py);
+
+ this._ripple2 = new St.BoxLayout({ style_class: styleClass,
+ opacity: 0,
+ can_focus: false,
+ reactive: false,
+ visible: false });
+ this._ripple2.set_pivot_point(px, py);
+
+ this._ripple3 = new St.BoxLayout({ style_class: styleClass,
+ opacity: 0,
+ can_focus: false,
+ reactive: false,
+ visible: false });
+ this._ripple3.set_pivot_point(px, py);
+ }
+
+ destroy() {
+ this._ripple1.destroy();
+ this._ripple2.destroy();
+ this._ripple3.destroy();
+ }
+
+ _animRipple(ripple, delay, duration, startScale, startOpacity, finalScale) {
+ // We draw a ripple by using a source image and animating it scaling
+ // outwards and fading away. We want the ripples to move linearly
+ // or it looks unrealistic, but if the opacity of the ripple goes
+ // linearly to zero it fades away too quickly, so we use a separate
+ // tween to give a non-linear curve to the fade-away and make
+ // it more visible in the middle section.
+
+ ripple.x = this._x;
+ ripple.y = this._y;
+ ripple.visible = true;
+ ripple.opacity = 255 * Math.sqrt(startOpacity);
+ ripple.scale_x = ripple.scale_y = startScale;
+ ripple.set_translation(-this._px * ripple.width, -this._py * ripple.height, 0.0);
+
+ ripple.ease({
+ opacity: 0,
+ delay,
+ duration,
+ mode: Clutter.AnimationMode.EASE_IN_QUAD,
+ });
+ ripple.ease({
+ scale_x: finalScale,
+ scale_y: finalScale,
+ delay,
+ duration,
+ mode: Clutter.AnimationMode.LINEAR,
+ onComplete: () => (ripple.visible = false),
+ });
+ }
+
+ addTo(stage) {
+ if (this._stage !== undefined)
+ throw new Error('Ripples already added');
+
+ this._stage = stage;
+ this._stage.add_actor(this._ripple1);
+ this._stage.add_actor(this._ripple2);
+ this._stage.add_actor(this._ripple3);
+ }
+
+ playAnimation(x, y) {
+ if (this._stage === undefined)
+ throw new Error('Ripples not added');
+
+ this._x = x;
+ this._y = y;
+
+ this._stage.set_child_above_sibling(this._ripple1, null);
+ this._stage.set_child_above_sibling(this._ripple2, this._ripple1);
+ this._stage.set_child_above_sibling(this._ripple3, this._ripple2);
+
+ // Show three concentric ripples expanding outwards; the exact
+ // parameters were found by trial and error, so don't look
+ // for them to make perfect sense mathematically
+
+ // delay time scale opacity => scale
+ this._animRipple(this._ripple1, 0, 830, 0.25, 1.0, 1.5);
+ this._animRipple(this._ripple2, 50, 1000, 0.0, 0.7, 1.25);
+ this._animRipple(this._ripple3, 350, 1000, 0.0, 0.3, 1);
+ }
+};